Welcome to HealthcareMagic. It looks like the sore in the mouth has formed after taking the drug. Do not take this drug, and avoid spicy or acidic foods during this time. You can use topical ointments
like numbing ointments, such as benzocaine
, anti-inflammatory (steroid) gels, benadryl
allergy liquid mouthwash, oral preparations of steroids
and vitamin supplements.
If the sore lasts for a few days then get it checked from an oral surgeon.
Hope it helps you. Regards.